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Origin and history

The Fort of Saint-Cyr, located at Montigny-le-Bretonneux (Yvelines), was built between 1875 and 1879 as part of the Séré de Rivières system, a network of fortifications designed after the French defeat of 1870 against Prussia. The purpose of this system was to protect Paris and its surroundings, including Versailles and strategic railways. The fort, of irregular polygonal plan, could accommodate up to 1,406 soldiers and was equipped with 90 artillery pieces, with an autonomy of three months in food.

After World War I, the fort lost its defensive role and was converted into a military weather station and weapons depot. From 1948 to 1982, it will be home to the École nationale de la météorologie, before its transfer to Toulouse. This change in usage reflected the changing military and scientific needs of the time, while preserving the existing infrastructure.

Since 1982, the fort has been assigned to the Ministry of Culture. Today it houses the photographic archives of the Audiovisual Library of Heritage and Photography, as well as 40,000 copies of films from the French Cinematheque, thanks to the initiative of Henri Langlois. Ranked a historic monument in 1992, it illustrates the rehabilitation of military heritage in a space dedicated to cultural conservation.

The Fort of Saint-Cyr is distinguished by its elaborate defensive architecture, combining glacis, flooded ditches and casemates connected by vaulted undergrounds. These features make it one of the best preserved works of the Séré de Rivières system in Île-de-France. Its initial implantation on Bois-d.

Designed to prevent access to the Trappes plateau and control the Havre and Tours railway axes, the fort was part of a global strategy of 18 forts, 5 dreads and 34 batteries around Paris. Its role was both offensive (protection of the ways) and defensive (cover Versailles and the Satory camp), reflecting the geopolitical concerns of the Third Republic after 1870.

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